do I understand you correctly that you were successful with the communication between the logger and an ESP32 on TTL level and using RS232 to TTL converter to a PC?
If that is the case, could you describe what is different now
Same logger or a different one?
Same logger configuration?
Identical wiring?
Different cables?
In addition:
Which Arduino board are you using?
Which Arduino pins are you using?
For everybody else: An online product manual is available here
I use cr basic, and i have printed it on terminal (sniff mode in devConfig) but i dont get anything or blanked data when i connected with cable (rs 232 adaptor) or i setting comc1 (in ttl mode) to connected with esp32 (serial 2)
Arduino mega but i haven't used it. First, i used adaptor (rs 232 to ttl, like Waveshare). I can connected and communicated with sensor use this adaptor, in rs 232 protocol
I used hardware Serial1
I have read tutorial or reference related sending data over rs 232 from Campbell but didnt work
I suspect the TX and RX are switched when connected to the RS-232 to TTL adapter. With the Campbell unit powered, the TX wire will have a voltage greater than +3 compared to the data ground.